What is the contractive phase of the heartbeat called?
What is the contractive phase of the heartbeat called?
Systole
Systole is the contraction phase of the heartbeat. During this phase, the right and left ventricles contract to pump blood to the lungs and body. Blood pressure measures pressure during both ventricular contraction (systolic pressure) and during relaxation (diastolic pressure).
What are the 3 heartbeat phases?
The cardiac cycle has 3 stages:
- Atrial and Ventricular diastole (chambers are relaxed and filling with blood)
- Atrial systole (atria contract and remaining blood is pushed into ventricles)
- Ventricular systole (ventricles contract and push blood out through aorta and pulmonary artery)
What are the 4 stages of a heartbeat?
The cardiac cycle involves four major stages of activity: 1) “Isovolumic relaxation”, 2) Inflow, 3) “Isovolumic contraction”, 4) “Ejection”.
What are the 2 phases of a complete heartbeat?
The cardiac cycle is essentially split into two phases, systole (the contraction phase) and diastole (the relaxation phase). Each of these is then further divided into an atrial and ventricular component.
What is afterload and preload?
Preload is the initial stretching of the cardiac myocytes (muscle cells) prior to contraction. It is related to ventricular filling. Afterload is the force or load against which the heart has to contract to eject the blood.
What is diastole and systole?
Diastole and systole are two phases of the cardiac cycle. They occur as the heart beats, pumping blood through a system of blood vessels that carry blood to every part of the body. Systole occurs when the heart contracts to pump blood out, and diastole occurs when the heart relaxes after contraction.
What are the 5 phases of the cardiac cycle?
Detailed descriptions of each phase can be obtained by clicking on each of the seven phases listed below.
- Phase 1 – Atrial Contraction.
- Phase 2 – Isovolumetric Contraction.
- Phase 3 – Rapid Ejection.
- Phase 4 – Reduced Ejection.
- Phase 5 – Isovolumetric Relaxation.
- Phase 6 – Rapid Filling.
- Phase 7 – Reduced Filling.
What does the term afterload mean?
Afterload is defined as the ventricular wall stress or tension that develops during systolic contraction and ejection of blood into the aorta.